Upgrade V8 to 5.1.281.57 DO NOT MERGE
FPIIM-449
Change-Id: Id981b686b4d587ac31697662eb98bb34be42ad90
(cherry picked from commit 3b9bc31999c9787eb726ecdbfd5796bfdec32a18)
diff --git a/src/debug/s390/debug-s390.cc b/src/debug/s390/debug-s390.cc
new file mode 100644
index 0000000..c6764c2
--- /dev/null
+++ b/src/debug/s390/debug-s390.cc
@@ -0,0 +1,165 @@
+// Copyright 2015 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "src/v8.h"
+
+#if V8_TARGET_ARCH_S390
+
+#include "src/codegen.h"
+#include "src/debug/debug.h"
+
+namespace v8 {
+namespace internal {
+
+#define __ ACCESS_MASM(masm)
+
+void EmitDebugBreakSlot(MacroAssembler* masm) {
+ Label check_size;
+ __ bind(&check_size);
+ // oill r3, 0
+ // oill r3, 0
+ __ nop(Assembler::DEBUG_BREAK_NOP);
+ __ nop(Assembler::DEBUG_BREAK_NOP);
+
+ // lr r0, r0 64-bit only
+ // lr r0, r0 64-bit only
+ // lr r0, r0 64-bit only
+ for (int i = 8; i < Assembler::kDebugBreakSlotLength; i += 2) {
+ __ nop();
+ }
+ DCHECK_EQ(Assembler::kDebugBreakSlotLength,
+ masm->SizeOfCodeGeneratedSince(&check_size));
+}
+
+void DebugCodegen::GenerateSlot(MacroAssembler* masm, RelocInfo::Mode mode) {
+ // Generate enough nop's to make space for a call instruction.
+ masm->RecordDebugBreakSlot(mode);
+ EmitDebugBreakSlot(masm);
+}
+
+void DebugCodegen::ClearDebugBreakSlot(Isolate* isolate, Address pc) {
+ CodePatcher patcher(isolate, pc, Assembler::kDebugBreakSlotLength);
+ EmitDebugBreakSlot(patcher.masm());
+}
+
+void DebugCodegen::PatchDebugBreakSlot(Isolate* isolate, Address pc,
+ Handle<Code> code) {
+ DCHECK_EQ(Code::BUILTIN, code->kind());
+ CodePatcher patcher(isolate, pc, Assembler::kDebugBreakSlotLength);
+ // Patch the code changing the debug break slot code from
+ //
+ // oill r3, 0
+ // oill r3, 0
+ // oill r3, 0 64-bit only
+ // lr r0, r0 64-bit only
+ //
+ // to a call to the debug break code, using a FIXED_SEQUENCE.
+ //
+ // iilf r14, <address> 6-bytes
+ // basr r14, r14A 2-bytes
+ //
+ // The 64bit sequence has an extra iihf.
+ //
+ // iihf r14, <high 32-bits address> 6-bytes
+ // iilf r14, <lower 32-bits address> 6-bytes
+ // basr r14, r14 2-bytes
+ patcher.masm()->mov(v8::internal::r14,
+ Operand(reinterpret_cast<intptr_t>(code->entry())));
+ patcher.masm()->basr(v8::internal::r14, v8::internal::r14);
+}
+
+bool DebugCodegen::DebugBreakSlotIsPatched(Address pc) {
+ Instr current_instr = Assembler::instr_at(pc);
+ return !Assembler::IsNop(current_instr, Assembler::DEBUG_BREAK_NOP);
+}
+
+void DebugCodegen::GenerateDebugBreakStub(MacroAssembler* masm,
+ DebugBreakCallHelperMode mode) {
+ __ RecordComment("Debug break");
+ {
+ FrameScope scope(masm, StackFrame::INTERNAL);
+
+ // Load padding words on stack.
+ __ LoadSmiLiteral(ip, Smi::FromInt(LiveEdit::kFramePaddingValue));
+ for (int i = 0; i < LiveEdit::kFramePaddingInitialSize; i++) {
+ __ push(ip);
+ }
+ __ LoadSmiLiteral(ip, Smi::FromInt(LiveEdit::kFramePaddingInitialSize));
+ __ push(ip);
+
+ // Push arguments for DebugBreak call.
+ if (mode == SAVE_RESULT_REGISTER) {
+ // Break on return.
+ __ push(r2);
+ } else {
+ // Non-return breaks.
+ __ Push(masm->isolate()->factory()->the_hole_value());
+ }
+ __ mov(r2, Operand(1));
+ __ mov(r3,
+ Operand(ExternalReference(
+ Runtime::FunctionForId(Runtime::kDebugBreak), masm->isolate())));
+
+ CEntryStub ceb(masm->isolate(), 1);
+ __ CallStub(&ceb);
+
+ if (FLAG_debug_code) {
+ for (int i = 0; i < kNumJSCallerSaved; i++) {
+ Register reg = {JSCallerSavedCode(i)};
+ // Do not clobber r2 if mode is SAVE_RESULT_REGISTER. It will
+ // contain return value of the function.
+ if (!(reg.is(r2) && (mode == SAVE_RESULT_REGISTER))) {
+ __ mov(reg, Operand(kDebugZapValue));
+ }
+ }
+ }
+
+ // Don't bother removing padding bytes pushed on the stack
+ // as the frame is going to be restored right away.
+
+ // Leave the internal frame.
+ }
+
+ // Now that the break point has been handled, resume normal execution by
+ // jumping to the target address intended by the caller and that was
+ // overwritten by the address of DebugBreakXXX.
+ ExternalReference after_break_target =
+ ExternalReference::debug_after_break_target_address(masm->isolate());
+ __ mov(ip, Operand(after_break_target));
+ __ LoadP(ip, MemOperand(ip));
+ __ JumpToJSEntry(ip);
+}
+
+void DebugCodegen::GenerateFrameDropperLiveEdit(MacroAssembler* masm) {
+ // Load the function pointer off of our current stack frame.
+ __ LoadP(r3, MemOperand(fp, FrameDropperFrameConstants::kFunctionOffset));
+
+ // Pop return address and frame
+ __ LeaveFrame(StackFrame::INTERNAL);
+
+ ParameterCount dummy(0);
+ __ FloodFunctionIfStepping(r3, no_reg, dummy, dummy);
+
+ // Load context from the function.
+ __ LoadP(cp, FieldMemOperand(r3, JSFunction::kContextOffset));
+
+ // Clear new.target as a safety measure.
+ __ LoadRoot(r5, Heap::kUndefinedValueRootIndex);
+
+ // Get function code.
+ __ LoadP(ip, FieldMemOperand(r3, JSFunction::kSharedFunctionInfoOffset));
+ __ LoadP(ip, FieldMemOperand(ip, SharedFunctionInfo::kCodeOffset));
+ __ AddP(ip, Operand(Code::kHeaderSize - kHeapObjectTag));
+
+ // Re-run JSFunction, r3 is function, cp is context.
+ __ Jump(ip);
+}
+
+const bool LiveEdit::kFrameDropperSupported = true;
+
+#undef __
+} // namespace internal
+} // namespace v8
+
+#endif // V8_TARGET_ARCH_S390